Zuhdi, Mahmud. “Improving Civics Education Learning Outcomes in 1908 National Awakening Spirit Materials by Using Problem Solving Learning Methods”. Bulletin of Pedagogical Research 2, no. 1 (February 24, 2022): 9-`19. Accessed May 6, 2026. https://attractivejournal.com/index.php/bpr/article/view/237.